Mono.Cecil VS Harmony

You mean Mono Cecil, native IL Emit or Reflection.Emit, or maybe LINQ Expressions?

Some more details https://github.com/pardeike/Harmony/issues/424

It's kind of a subtle distinction that I think was lost between the posted article and the original article it was responding to, but I don't think the kinds of reflection capabilities that Roslyn provides is what the author intended. The specific example given in the referenced article for "Higher-order programs" specifically refers to the ability to replace function implementations at runtime without interrupting the program, and specifically calls out hot-code reloading (such as what Java provides) as a deficient form of similar functionality. This is closer to the type of functionality libraries like Harmony provide, but even that solution requires including the library and instrumenting your code ahead of time.

Download Harmony 2 and put net472 version of the library into GordianQuest_Data\Managed

If you’re unfamiliar with the term Monkey patching, it’s a process of changing some code “on-the-fly”, where the author of the code didn’t necessarily want that behaviour. It isn’t, however, something you can do in C# (or .NET) in general. There are some libraries like Harmony that can do it partially, but are based around your code running and doing the patching of the libraries. The general premise is that you want to redirect a call between a method the code thought it was going to call, and some other method. This can be incredibly useful if want to change/fix the functionality of something you don’t control. Khalid (@buhakmeh) has a post on some of these approaches here, and we’re going to look at an alternative that has a very narrow use case.